User`s guide

4-28 Configuring Your Server
RAID Controller
HDD 1 HDD 2 HDD 3
Stripe 2
Parity (3, 4)
Stripe 5
Parity (1, 2)
Stripe 3
Stripe 6
Stripe 1
Stripe 4
Parity (5, 6)
RAID6
A RAID 6 extends RAID 5 by adding an additional parity block (Q) created by different calculation method such as weighting
by some factor, thus it uses block-level striping with two parity blocks distributed across all member disks. This mode is called
"striping with duplex and distributed parity". Accordingly, the total capacity assigned to the parity is just the same as the
capacity of two HDDs. If two of the HDDs configuring a logical drive are defective, data is still available without problems.
RAID Controller
HDD 1 HDD 2
Stripe 1
HDD 3
Stripe 4
Stripe 2
Parity P (3,4)
Parity P (1,2)
Parity Q (3,4)
Parity P (5,6) Parity Q (5,6) Stripe 5
HDD 4
Parity Q (1,2)
Stripe 3
Stripe 6
Parity Q (7,8) Stripe 7 Stripe 8 Parity P (7,8)